> Dirty30 Dillon Wrote:
> -------------------------------------------------------
> > Seth B Wrote:
>
> > -------------------------------------------------------
>
> > It’s highly recommended to put an o-ring between that shim & the carb
>
> > body to prevent air leaks.
>
> 100% not needed, just make sure your shim is intake and you seat the
> carb. The airleak comes in through the gap in the clamp mount, which is
> completely covered if you have the correct shim, undamaged. The oring is
> useful on carbs where that shim doesn't exist, a la Puch Bing's.
I’ve Never needed to o-ring a Bing, but I’ve had multiple leaky SHA shims.